Combustion and Flame (CBSE Class-8 Science): Questions 28 - 33 of 33

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Question number: 28

» Combustion and Flame » Fire » Fire Extinguisher

MCQ▾

Question

Types of fire that cannot be controlled by throwing water are:

Choices

Choice (4) Response

a.

Fire produced by crackers

b.

Fire produced by burning of oil or petrol

c.

Fire produced by electric short circuit

d.

Both b. and c. are correct

Question number: 29

» Combustion and Flame » Fuel » Burning of Fuels Leads to Harmful Products

MCQ▾

Question

Burning of coal, diesel and petrol releases gases like:

Choices

Choice (4) Response

a.

Water gas

b.

CO2, CO

c.

SO2 and NO2

d.

Producer gas

Question number: 30

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

On the basis of physical state fuels are divided in:

Choices

Choice (4) Response

a.

Raw fuels and processed fuels

b.

Natural fuels and manufactured fuels

c.

Solid fuels, Liquid fuels, gaseous fuels

d.

Both a. and b. are correct

Question number: 31

» Combustion and Flame » Fire » How Do We Control Fire?

MCQ▾

Question

Fire can be controlled by:

Choices

Choice (4) Response

a.

Presence of combustible substance

b.

If any of the condition require for combustion are not met then fire can be extinguished

c.

Presence of supporter of combustion (oxygen of air)

d.

Attainment of proper ignition temperature

Question number: 32

» Combustion and Flame » Combustion » Ignition Temperature

MCQ▾

Question

Ignition temperature is defined as:

Choices

Choice (4) Response

a.

The amount of heat energy produced on complete combustion of 1 Kg of a fuel

b.

A substance which produce energy when burnt in presence of oxygen

c.

Lowest temperature at which substance catches fire

d.

None of the above

Question number: 33

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

Natural fuels are also called as:

Choices

Choice (4) Response

a.

Raw fuels

b.

Processed fuels

c.

Manufactured fuels

d.

All of the above

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